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Title: Rotational effects in the band oscillator strengths and predissociation linewidths for the lowest {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +} transitions of N{sub 2}

Abstract

A coupled-channel Schroedinger equation (CSE) model of N{sub 2} photodissociation, which includes the effects of all interactions between the b, c, and o {sup 1}{pi}{sub u} and the C and C{sup '} {sup 3}{pi}{sub u} states, is employed to study the effects of rotation on the lowest-{upsilon} {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +}({upsilon},0) band oscillator strengths and {sup 1}{pi}{sub u} predissociation linewidths. Significant rotational dependences are found which are in excellent agreement with recent experimental results, where comparisons are possible. New extreme-ultraviolet (EUV) photoabsorption spectra of the key b {sup 1}{pi}{sub u}<-X {sup 1}{sigma}{sub g}{sup +}(3,0) transition of N{sub 2} are also presented and analyzed, revealing a b({upsilon}=3) predissociation linewidth peaking near J=11. This behavior can be reproduced only if the triplet structure of the C state is included explicitly in the CSE-model calculations, with a spin-orbit constant A{approx_equal}15 cm{sup -1} for the diffuse C({upsilon}=9) level which accidentally predissociates b({upsilon}=3). The complex rotational behavior of the b-X(3,0) and other bands may be an important component in the modeling of EUV transmission through nitrogen-rich planetary atmospheres.

Authors:
; ; ;  [1]
  1. Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia)
Publication Date:
OSTI Identifier:
20723265
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 21; Other Information: DOI: 10.1063/1.2134704; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; EXTREME ULTRAVIOLET RADIATION; L-S COUPLING; LINE WIDTHS; NITROGEN; OSCILLATOR STRENGTHS; PHOTON-MOLECULE COLLISIONS; PREDISSOCIATION; ROTATION; ROTATIONAL STATES; SCHROEDINGER EQUATION; SIMULATION; ULTRAVIOLET SPECTRA

Citation Formats

Haverd, V E, Lewis, B R, Gibson, S T, Stark, G, and Department of Physics, Wellesley College, Wellesley, Massachusetts 02481. Rotational effects in the band oscillator strengths and predissociation linewidths for the lowest {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +} transitions of N{sub 2}. United States: N. p., 2005. Web. doi:10.1063/1.2134704.
Haverd, V E, Lewis, B R, Gibson, S T, Stark, G, & Department of Physics, Wellesley College, Wellesley, Massachusetts 02481. Rotational effects in the band oscillator strengths and predissociation linewidths for the lowest {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +} transitions of N{sub 2}. United States. https://doi.org/10.1063/1.2134704
Haverd, V E, Lewis, B R, Gibson, S T, Stark, G, and Department of Physics, Wellesley College, Wellesley, Massachusetts 02481. 2005. "Rotational effects in the band oscillator strengths and predissociation linewidths for the lowest {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +} transitions of N{sub 2}". United States. https://doi.org/10.1063/1.2134704.
@article{osti_20723265,
title = {Rotational effects in the band oscillator strengths and predissociation linewidths for the lowest {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +} transitions of N{sub 2}},
author = {Haverd, V E and Lewis, B R and Gibson, S T and Stark, G and Department of Physics, Wellesley College, Wellesley, Massachusetts 02481},
abstractNote = {A coupled-channel Schroedinger equation (CSE) model of N{sub 2} photodissociation, which includes the effects of all interactions between the b, c, and o {sup 1}{pi}{sub u} and the C and C{sup '} {sup 3}{pi}{sub u} states, is employed to study the effects of rotation on the lowest-{upsilon} {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +}({upsilon},0) band oscillator strengths and {sup 1}{pi}{sub u} predissociation linewidths. Significant rotational dependences are found which are in excellent agreement with recent experimental results, where comparisons are possible. New extreme-ultraviolet (EUV) photoabsorption spectra of the key b {sup 1}{pi}{sub u}<-X {sup 1}{sigma}{sub g}{sup +}(3,0) transition of N{sub 2} are also presented and analyzed, revealing a b({upsilon}=3) predissociation linewidth peaking near J=11. This behavior can be reproduced only if the triplet structure of the C state is included explicitly in the CSE-model calculations, with a spin-orbit constant A{approx_equal}15 cm{sup -1} for the diffuse C({upsilon}=9) level which accidentally predissociates b({upsilon}=3). The complex rotational behavior of the b-X(3,0) and other bands may be an important component in the modeling of EUV transmission through nitrogen-rich planetary atmospheres.},
doi = {10.1063/1.2134704},
url = {https://www.osti.gov/biblio/20723265}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 21,
volume = 123,
place = {United States},
year = {2005},
month = {12}
}